You need to use the GCF when you reduce fractions. The GCF is the number that divides numerator and denominator to get the fraction down to lowest terms. You also use the GCF to factor polynomials in algebra. You take it out the when you factor a polynomial if . This technique depends on knowing how to get the GCF (Greatest Common Factor) for the same numbers, but I’ll cover that in next month’s article, and show that there’s a trick for that as well. Back to the LCM, here’s the quick-and-easy way to find it. 1st) Find the GCF for your two denominators. In our example of 3/16 + 11/24, the. LCM and GCF To find either the Least Common Multiple (LCM) or Greatest Common Factor (GCF) of two numbers, you always start out the same way: you find Then (here's the trick!) you put the factors into a nice neat grid of rows and columns, compare and contrast, and then, from the table, take.

# Easy way to find gcf and lcm

mathtalk-quick GCF and LCM, time: 3:51

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